#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
int main()
{
    pid_t id = fork();
    if(id < 0)
    {
        perror("fork");
        return 1;
    }
    else if(id == 0)
    {
        //child
        int cnt = 5;
        while(cnt)
        {
            printf("I am child, pid:%d,ppid:%d\n",getpid(),getppid());
            cnt--;
            sleep(1);
        }
        exit(0);
    }
    else
    {
        int cnt = 10;
        //parent
        while(1)
        {
            printf("I am father pid:%d,ppid:%d\n",getpid(),getppid());
            cnt--;
            sleep(1);
        }
    }
    return 0;
}
